/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<L.size(); i++){
               ~^~~~~~~~~
/in/foo.cc:34:6: warning: unused variable 'a' [-Wunused-variable]
  int a[1000];
      ^
/in/foo.cc:35:6: warning: unused variable 'k' [-Wunused-variable]
  int k=0;
      ^
/in/foo.cc:35:9: error: expected '}' at end of input
  int k=0;
         ^